Note: US Airways and America West started to report combined on-time data in January 2006 and combined traffic and financial data in October 2007 following their 2005 merger announcement. Delta and Northwest began reporting jointly in January 2010 following their 2008 merger announcement. Continental Micronesia was combined into Continental Airlines in December 2010 and joint reporting began in January 2011. Atlantic Southeast and ExpressJet began reporting jointly in January 2012. United and Continental began reporting jointly in January 2012 following their 2010 merger announcement. Endeavor (9E) operated as Pinnacle prior to August 2013. Envoy (MQ) operated as American Eagle prior to April 2014. Southwest (WN) and AirTran (FL) began reporting jointly in January 2015 following their 2011 merger announcement.